A while back i got a great deal on a pepsi bottle i never saw and found out it was a salesmans sample prototype. I was just looking at the bottle and noticed the opening in the mouth in the top is triangular shape. It looks as if a tool of some type was used to pick up bottle from the inside of the neck causing the shape of a triangle. I wish the pictures were clearer but here it is first the bottle then three pictures of the opening. Ever see an opening like this on another bottle? Maybe the bottle maker showing off a little? What do you think.